Memory Game The Endocrine SystemOnline version Review the organs of the endocrine system and their functions. by Kathy Dilliplane Pituitary Thyroid Parathyroid Glands Thymus Regulates blood sugar levels Regulate the male reproductive system Pineal Gland Produces melatonin to regulate sleep cycles Testes Regulates growth and metabolism Ovaries Regulates calcium levels in the blood. Regulates the female reproductive system Helps the immune system recognize and fight pathogens Pancreas Adrenal Glands Increase heart rate during a "Fight or Flight" response The body's "Master Gland" that controls the other endocrine organs.